(HealthDay)—More than two-thirds of Colorado cannabis dispensaries recommend cannabis products to treat nausea during the first trimester of pregnancy, according to a study published online May 7 in Obstetrics & Gynecology.

Betsy Dickson, M.D., from the University of Colorado in Aurora, and colleagues used a mystery caller to collect advice from marijuana dispensaries regarding cannabis product use during .

The researchers contacted 400 dispensaries (37 percent were licensed for medical sale, 28 percent for retail, and 35 percent for both). More than two-thirds of dispensaries (69 percent) recommended cannabis products for the treatment of morning sickness, although the recommendations varied by license type (medical, 83.1 percent; retail, 60.4 percent; both, 61.7 percent; P < 0.001). A similar percent (65 percent) based their recommendation for use in pregnancy on personal opinion, while a lower percent (36 percent) stated cannabis use is safe in pregnancy. Most of the dispensaries (81.5 percent) recommended discussion with a , but only 31.8 percent made this recommendation without being prompted.

"As cannabis legalization expands, policy and education efforts should involve dispensaries," the authors write.